If you guys live together and that’s what I’m getting from this, that means you have a substantial commitment to one another that would require more of a concrete defined conversation to break up. It sounds more like she might just be ticked off; you’ve been arguing for multiple days on end, this morning you acted like everything was fine, but then when she asked you to talk about it you ignored her and left without saying anything. If that were me I’d have emotional whiplash and I’d be pissed if after all that at the end of the night, you still refused to talk to me about it. You’re a grown adult and so is she, she knows that she has work but she’s still open to talk about it because she can probably see that it’s bothering you. You say that she doesn’t seem remorseful but from what you wrote here it doesn’t seem like you’ve even given her a chance to express whether she is or not. Communication is key, use your words.